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<tr class="t-nv"><td colspan="5"><div class="t-nv-ln-table"><div><strong class="selflink"><span class="t-lines"><span>wcsrtombs</span><span>wcsrtombs_s</span></span></strong></div><div><span class="t-lines"><span><span class="t-mark-rev t-since-c95">(C95)</span></span><span><span class="t-mark-rev t-since-c11">(C11)</span></span></span></div></div></td></tr>
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<tr class="t-nv-h2"><td colspan="5"> 类型</td></tr>
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</table></div><div></div></div></div></div><div class="t-navbar-sep"> </div></div>
<table class="t-dcl-begin"><tbody>
<tr class="t-dsc-header">
<td> <div>定义于头文件 <code>&lt;wchar.h&gt;</code>
 </div></td>
<td></td>
<td></td>
</tr>
</tbody>
<tbody class="t-dcl-rev t-dcl-rev-num"><tr class="t-dcl-rev-aux">
<td></td>
<td rowspan="142">(1)</td>
<td></td>
</tr>
<tr class="t-dcl t-since-c95">
<td> <div><span class="mw-geshi c source-c"><a href="../../types/size_t.html"><span class="kw100">size_t</span></a> wcsrtombs<span class="br0">(</span> <span class="kw4">char</span> <span class="sy2">*</span>dst, <span class="kw4">const</span> <span class="kw4">wchar_t</span> <span class="sy2">**</span>src, <a href="../../types/size_t.html"><span class="kw100">size_t</span></a> len, <a href="mbstate_t.html"><span class="kw591">mbstate_t</span></a><span class="sy2">*</span> ps <span class="br0">)</span><span class="sy4">;</span></span></div></td>
<td class="t-dcl-nopad">  </td>
<td> <span class="t-mark-rev t-since-c95">(C95 起)</span> </td>
</tr>
<tr class="t-dcl t-since-c99">
<td> <div><span class="mw-geshi c source-c"><a href="../../types/size_t.html"><span class="kw100">size_t</span></a> wcsrtombs<span class="br0">(</span> <span class="kw4">char</span> <span class="sy2">*</span><span class="kw4">restrict</span> dst, <span class="kw4">const</span> <span class="kw4">wchar_t</span> <span class="sy2">**</span><span class="kw4">restrict</span> src, <a href="../../types/size_t.html"><span class="kw100">size_t</span></a> len,<br>
                  <a href="mbstate_t.html"><span class="kw591">mbstate_t</span></a> <span class="sy2">*</span><span class="kw4">restrict</span> ps<span class="br0">)</span><span class="sy4">;</span></span></div></td>
<td class="t-dcl-nopad">  </td>
<td> <span class="t-mark-rev t-since-c99">(C99 起)</span> </td>
</tr>
</tbody><tbody>
<tr class="t-dcl t-since-c11">
<td> <div><span class="mw-geshi c source-c">errno_t wcsrtombs_s<span class="br0">(</span> <a href="../../types/size_t.html"><span class="kw100">size_t</span></a> <span class="sy2">*</span><span class="kw4">restrict</span> retval, <span class="kw4">char</span> <span class="sy2">*</span><span class="kw4">restrict</span> dst, rsize_t dstsz,<br>
<p>                     <span class="kw4">const</span> <span class="kw4">wchar_t</span> <span class="sy2">**</span><span class="kw4">restrict</span> src, rsize_t len,<br>
</p>
                     <a href="mbstate_t.html"><span class="kw591">mbstate_t</span></a> <span class="sy2">*</span><span class="kw4">restrict</span> ps<span class="br0">)</span><span class="sy4">;</span></span></div></td>
<td> (2) </td>
<td> <span class="t-mark-rev t-since-c11">(C11 起)</span> </td>
</tr>
<tr class="t-dcl-sep"><td></td><td></td><td></td></tr>
</tbody></table>
<div class="t-li1"><span class="t-li">1)</span> 转换来自元素为 <span class="t-c"><span class="mw-geshi c source-c"><span class="sy2">*</span>src</span></span> 所指向的宽字符序列为其窄多字节表示，始于 <span class="t-c"><span class="mw-geshi c source-c"><span class="sy2">*</span>ps</span></span> 所描述的转换状态。若 <code>dst</code> 非空，则存储转换后的字符于 <code>dst</code> 所指向的字符数组的相接元素。不写入多于 <code>len</code> 个字节到目标数组。</div>
<div class="t-li1"><span class="t-li"></span> 如同以调用 <span class="t-lc"><a href="wcrtomb.html" title="c/string/multibyte/wcrtomb">wcrtomb</a></span> 转换每个字符。若遇到下列条件则停止转换：</div>
<div class="t-li1"><span class="t-li"></span> * 转换并存储了空字符 <span class="t-c"><span class="mw-geshi c source-c">L<span class="st0">'<span class="es5">\0</span>'</span></span></span> 。此情况下存储的字节是反迁移序列（若需要）后随 <span class="t-c"><span class="mw-geshi c source-c"><span class="st0">'<span class="es5">\0</span>'</span></span></span> ，设置 <span class="t-c"><span class="mw-geshi c source-c"><span class="sy2">*</span>src</span></span> 为 <span class="t-lc"><a href="../../types/NULL.html" title="c/types/NULL">NULL</a></span> 并令 <span class="t-c"><span class="mw-geshi c source-c"><span class="sy2">*</span>ps</span></span> 表示初始迁移状态。</div>
<div class="t-li1"><span class="t-li"></span> * 找到当前 C 本地环境中不对应合法字符的 <span class="t-c"><span class="mw-geshi c source-c"><span class="kw4">wchar_t</span></span></span> 。设置 <span class="t-c"><span class="mw-geshi c source-c"><span class="sy2">*</span>src</span></span> 指向首个未转换的宽字符。</div>
<div class="t-li1"><span class="t-li"></span> * 下个多字节字符将超出 <code>len</code> 。设置 <span class="t-c"><span class="mw-geshi c source-c"><span class="sy2">*</span>src</span></span> 指向首个未转换的宽字符。若 <span class="t-c"><span class="mw-geshi c source-c">dst<span class="sy1">==</span><a href="../../types/NULL.html"><span class="kw103">NULL</span></a></span></span> 则不检查此条件。</div>
<div class="t-li1"><span class="t-li">2)</span> 同 <span class="t-v">(1)</span> ，除了</div>
<div class="t-li1"><span class="t-li"></span> * 函数返回其结果为输出参数 <code>retval</code></div>
<div class="t-li1"><span class="t-li"></span> * 若转换停止而不写入空字符，则函数将存储 <span class="t-c"><span class="mw-geshi c source-c"><span class="st0">'<span class="es5">\0</span>'</span></span></span> 于 <code>dst</code> 的下个字节，它可以是 <code>dst[len]</code> 或 <code>dst[dstsz]</code> ，两者的先到来者（表示总共可能写入 len+1/dstsz+1 字节）。此情况下，在终止空字符前可以无反迁移序列。</div>
<div class="t-li1"><span class="t-li"></span> * 函数从终止空字符 <code>dstsz</code> 到位置破坏数组</div>
<div class="t-li1"><span class="t-li"></span> * 若 <code>src</code> 与 <code>dst</code> 重叠，则行为未指定。</div>
<div class="t-li1"><span class="t-li"></span> * 在运行时检测下列错误，并调用当前安装的<a href="../../error/set_constraint_handler_s.html" title="c/error/set constraint handler s">制约处理</a>函数：
<dl><dd><ul><li> <code>retval</code> 、 <code>ps</code> 、 <code>src</code> 或 <span class="t-c"><span class="mw-geshi c source-c"><span class="sy2">*</span>src</span></span> 为空指针
</li><li> <code>dstsz</code> 或 <code>len</code> 大于 <span class="t-lc">RSIZE_MAX</span> （除非 <code>dst</code> 为空）
</li><li> <code>dstsz</code> 非零（除非 <code>dst</code> 为空）
</li><li> <code>len</code> 大于 <code>dstsz</code> 且转换在抵达 <code>dstsz</code> 时于 <code>src</code> 数组中未遇到空字符或编码错误（除非 <code>dst</code> 为空）
</li></ul>
</dd><dd>
</dd><dd>同所有边界检查函数， <code>wcsrtombs_s</code> 仅若实现定义了 <span class="t-c"><span class="mw-geshi c source-c">__STDC_LIB_EXT1__</span></span> ，且用户在包含 <code>wchar.h</code> 前定义 <span class="t-c"><span class="mw-geshi c source-c">__STDC_WANT_LIB_EXT1__</span></span> 为整数常量 <span class="t-c"><span class="mw-geshi c source-c"><span class="nu0">1</span></span></span> 才保证可用。</dd></dl></div>

<h3><span class="mw-headline" id=".E5.8F.82.E6.95.B0">参数</span></h3>
<table class="t-par-begin">


<tr class="t-par">
<td>  dst
</td>
<td> -
</td>
<td> 指向窄字符数组的指针，其中将存储多字节字符
</td></tr>
<tr class="t-par">
<td>  src
</td>
<td> -
</td>
<td> 指向指向空终止宽字符串首元素的指针的指针
</td></tr>
<tr class="t-par">
<td>  len
</td>
<td> -
</td>
<td> dst 所指向的数组中可用的字节数
</td></tr>
<tr class="t-par">
<td>  ps
</td>
<td> -
</td>
<td> 指向转换状态对象的指针
</td></tr>
<tr class="t-par">
<td>  dstsz
</td>
<td> -
</td>
<td> 将写入的最大字节数（ <code>dst</code> 数组的大小）
</td></tr>
<tr class="t-par">
<td>  retval
</td>
<td> -
</td>
<td> 指向将存储结果于其中的 size_t 对象的指针
</td></tr></table>
<h3><span class="mw-headline" id=".E8.BF.94.E5.9B.9E.E5.80.BC">返回值</span></h3>
<div class="t-li1"><span class="t-li">1)</span> 成功时，返回写入首元素为 <code>dst</code> 所指向的字符数组的字节数（包含任何迁移序列，但不包含终止 <span class="t-c"><span class="mw-geshi c source-c"><span class="st0">'<span class="es5">\0</span>'</span></span></span> ）。若 <span class="t-c"><span class="mw-geshi c source-c">dst<span class="sy1">==</span><a href="../../types/NULL.html"><span class="kw103">NULL</span></a></span></span> ，则返回本会写入的字节数。错误时（若遇到非法宽字符），返回 <span class="t-c"><span class="mw-geshi c source-c"><span class="br0">(</span><a href="../../types/size_t.html"><span class="kw100">size_t</span></a><span class="br0">)</span><span class="sy2">-</span><span class="nu0">1</span></span></span> ，存储 <span class="t-lc"><a href="../../error/errno_macros.html" title="c/error/errno macros">EILSEQ</a></span> 于 <span class="t-lc"><a href="../../error/errno.html" title="c/error/errno">errno</a></span> ，并令 <span class="t-c"><span class="mw-geshi c source-c"><span class="sy2">*</span>ps</span></span> 留在未指定状态。</div>
<div class="t-li1"><span class="t-li">2)</span> 成功时返回零（该情况下将不包含终止零写入或本会写入到 <code>dst</code> 的字符数存储于 <span class="t-c"><span class="mw-geshi c source-c"><span class="sy2">*</span>retval</span></span> ），错误时返回非零。在运行时制约违规的情况下，存储 <span class="t-c"><span class="mw-geshi c source-c"><span class="br0">(</span><a href="../../types/size_t.html"><span class="kw100">size_t</span></a><span class="br0">)</span><span class="sy2">-</span><span class="nu0">1</span></span></span> 于 <span class="t-c"><span class="mw-geshi c source-c"><span class="sy2">*</span>retval</span></span> （除非 <code>retval</code> 为空）并设置 <span class="t-c"><span class="mw-geshi c source-c">dst<span class="br0">[</span><span class="nu0">0</span><span class="br0">]</span></span></span> 为 <span class="t-c"><span class="mw-geshi c source-c"><span class="st0">'<span class="es5">\0</span>'</span></span></span> （除非 <code>dst</code> 为空或 <code>dstmax</code> 为零或大于 <span class="t-lc">RSIZE_MAX</span> ）。</div>
<h3><span class="mw-headline" id=".E7.A4.BA.E4.BE.8B">示例</span></h3>
<div class="t-example"><div class="t-example-live-link"><div class="coliru-btn coliru-btn-run-init">运行此代码</div></div>
<div dir="ltr" class="mw-geshi" style="text-align: left;"><div class="c source-c"><pre class="de1"><span class="co2">#include &lt;stdio.h&gt;</span>
<span class="co2">#include &lt;locale.h&gt;</span>
<span class="co2">#include &lt;string.h&gt;</span>
<span class="co2">#include &lt;wchar.h&gt;</span>
 
<span class="kw4">void</span> print_wide<span class="br0">(</span><span class="kw4">const</span> <span class="kw4">wchar_t</span><span class="sy2">*</span> wstr<span class="br0">)</span>
<span class="br0">{</span>
    <a href="mbstate_t.html"><span class="kw591">mbstate_t</span></a> state<span class="sy4">;</span>
    <a href="../byte/memset.html"><span class="kw571">memset</span></a><span class="br0">(</span><span class="sy3">&amp;</span>state, <span class="nu0">0</span>, <span class="kw4">sizeof</span> state<span class="br0">)</span><span class="sy4">;</span>
    <a href="../../types/size_t.html"><span class="kw100">size_t</span></a> len <span class="sy1">=</span> <span class="nu0">1</span> <span class="sy2">+</span> wcsrtombs<span class="br0">(</span><a href="../../types/NULL.html"><span class="kw103">NULL</span></a>, <span class="sy3">&amp;</span>wstr, <span class="nu0">0</span>, <span class="sy3">&amp;</span>state<span class="br0">)</span><span class="sy4">;</span>
    <span class="kw4">char</span> mbstr<span class="br0">[</span>len<span class="br0">]</span><span class="sy4">;</span>
    wcsrtombs<span class="br0">(</span>mbstr, <span class="sy3">&amp;</span>wstr, len, <span class="sy3">&amp;</span>state<span class="br0">)</span><span class="sy4">;</span>
    <a href="../../io/fprintf.html"><span class="kw850">printf</span></a><span class="br0">(</span><span class="st0">"Multibyte string: %s<span class="es1">\n</span>"</span>, mbstr<span class="br0">)</span><span class="sy4">;</span>
    <a href="../../io/fprintf.html"><span class="kw850">printf</span></a><span class="br0">(</span><span class="st0">"Length, including '<span class="es1">\\</span>0': %d<span class="es1">\n</span>"</span>, len<span class="br0">)</span><span class="sy4">;</span>
<span class="br0">}</span>
 
<span class="kw4">int</span> main<span class="br0">(</span><span class="kw4">void</span><span class="br0">)</span>
<span class="br0">{</span>
    <a href="../../locale/setlocale.html"><span class="kw900">setlocale</span></a><span class="br0">(</span><a href="../../locale/LC_categories.html"><span class="kw903">LC_ALL</span></a>, <span class="st0">"en_US.utf8"</span><span class="br0">)</span><span class="sy4">;</span>
    print_wide<span class="br0">(</span>L<span class="st0">"z<span class="es3">\u00df</span><span class="es3">\u6c34</span><span class="es4">\U0001f34c</span>"</span><span class="br0">)</span><span class="sy4">;</span> <span class="co1">// 或 L"zß水🍌"</span>
<span class="br0">}</span></pre></div></div>
<p>输出：
</p>
<div dir="ltr" class="mw-geshi" style="text-align: left;"><div class="text source-text"><pre class="de1">Multibyte string: zß水🍌
Length, including '\0': 11</pre></div></div> 
</div>
<h3><span class="mw-headline" id=".E5.BC.95.E7.94.A8">引用</span></h3>
<div class="t-ref-std-11">
<ul><li> C11 standard (ISO/IEC 9899:2011): 
</li></ul>
<dl><dd><ul><li> 7.29.6.4.2 The wcsrtombs function (p: 446)
</li></ul>
</dd></dl>
<dl><dd><ul><li> K.3.9.3.2.2 The wcsrtombs_s function (p: 649-651)
</li></ul>
</dd></dl>
<div class="t-ref-std-c99">
<ul><li> C99 standard (ISO/IEC 9899:1999): 
</li></ul>
<dl><dd><ul><li> 7.24.6.4.2 The wcsrtombs function (p: 392)
</li></ul>
</dd></dl>
</div>
<h3><span class="mw-headline" id=".E5.8F.82.E9.98.85">参阅</span></h3>
<table class="t-dsc-begin">

<tr class="t-dsc">
<td>  <div class="t-dsc-member-div"><div><a href="wcstombs.html" title="c/string/multibyte/wcstombs"> <span class="t-lines"><span>wcstombs</span><span>wcstombs_s</span></span></a></div><div><span class="t-lines"><span></span><span><span class="t-mark-rev t-since-c11">(C11)</span></span></span></div></div>
</td>
<td>   将宽字符串转换成窄多字节字符串 <br> <span class="t-mark">(函数)</span> </td></tr>

<tr class="t-dsc">
<td>  <div class="t-dsc-member-div"><div><a href="wcrtomb.html" title="c/string/multibyte/wcrtomb"> <span class="t-lines"><span>wcrtomb</span><span>wcrtomb_s</span></span></a></div><div><span class="t-lines"><span><span class="t-mark-rev t-since-c95">(C95)</span></span><span><span class="t-mark-rev t-since-c11">(C11)</span></span></span></div></div>
</td>
<td>   给定状态，将宽字符转换成其多字节表示 <br> <span class="t-mark">(函数)</span> </td></tr>

<tr class="t-dsc">
<td>  <div class="t-dsc-member-div"><div><a href="mbsrtowcs.html" title="c/string/multibyte/mbsrtowcs"> <span class="t-lines"><span>mbsrtowcs</span><span>mbsrtowcs_s</span></span></a></div><div><span class="t-lines"><span><span class="t-mark-rev t-since-c95">(C95)</span></span><span><span class="t-mark-rev t-since-c11">(C11)</span></span></span></div></div>
</td>
<td>   给定状态，将窄多字节字符串转换成宽字符串 <br> <span class="t-mark">(函数)</span> </td></tr>

</table></div>

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